J Med Assoc Thai 2003; 86 (6):562

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Choroidal Osteoma in Oriental Patients
Warrasak S Mail, Suvamamani C , Euswas A , Sumetpimolchai V , Laothamatas J

Background: Choroidal osteoma is a rare tumour of the choroid. This is the first report of
cases of choroidal osteoma in Thai patients.
Objective: To report the clinical characteristics, imaging findings and long-term follow-up
of choroidal osteoma in four Oriental patients.
Method: Four cases of choroidal osteoma were observed for 5 years or more.
Results: All patients were young female patients whose ages ranged from 24 to 37 years.
Three were unilateral and one was bilateral. The tumors were located at the juxtapapillary and macu-
lar area with overlying serous retinal detachment. Two patients had previous thyroid diseases and one
was pregnant when the tumors were diagnosed. Osteoma did not develop in the vicinity of posterior
staphyloma of high myopic eyes. Echography showed acoustic features of a plano-convex sonically
dense lesion with high reflectivity echoes which persisted despite lower system sensitivity. None had
subretinal neovascularization. Subretinal fluid disappeared spontaneously within one to 14 months in
three patients. Gradual growth of the tumor in a pseudopodium manner developed from two to six
years after initial examination. Decalcification occurred spontaneously or after laser ablation.
Conclusions: The authors presented four Oriental patients with choroidal osteoma who were
observed for at least 5 years. Echography is the best method for identifying this lesion and has unique
acoustic features. Subretinal fluid can be seen in the absence of subretinal neovascularization and
resorbs spontaneously. Decalcification occurred as a natural process or after laser ablative treatment.
Hormonal changes may implicate the development of this tumor.
Key word : Choroidal Osteoma, Oriental Patients, Echography, MRI

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